Multiple-unit pump



1,522,349 J. A. VIVARTTAS MULTIPLE UNIT PUMP Filed May 26, 1920 2 Sheets-Sheet l 1N VEN T OR fi/m A, V/mmr ATTORNEY Patented den. 5,

UNl-.TED STATES PATENT OFFICE.

JOHN A. VIVARTTAS, on wnsr NEW YORK, nnw zrnnsnr, AssIsnon T0 JOHN A. ABNG'LD. or LOUIS, MISSOURI.

MULTIILE-UNIT PUMP.

Application filed May 26.

To all whom it may concern:

Be it known that LJOHN A. VIvAR'i'rAs, a citizen of the United States, and a resident of West New York, in the county of Hudson and Stateof New Jersey, have invented new and useful Improvements in Multiple-Unit Pumps, of which the following is a full, clear, and exact description.

Among the principal objects which the present invention has in view: To promote a steady delivery of water; to avoid a water ram; to increase the efficiency; and to adapt a pump of the character mentioned to be driven by an explosive engine.

Drawings.

Figure 1 is a vertical section of a pump constructed and arranged in accordance with the present invention, the section being taken on the line 11 in Figure 2.

Figure 2 is a horizontal section taken on the line 2-2 in Figure 1.

Figure 3 is a vertical cross-section, the section being taken on the line 33 in Figure 1.

Figure 4 is a vertical cross-section of :1 fragment of the pump, the section being taken on the line 4t in Figure 1.

Desam'ption.

As will be seen in the drawings, the openings from the ports 9 and 10 to the cylinders 11 extend around one-half of the circumference of the said cylinders 11. By this means the delivery and intake of the water to the said cylinders is impeded as little as possible. The U-valve 12 is used in the present pump is of the type generally employed in steam engines as slide valves. In the present construction these valves are driven by eccentrics mounted on the crank shaft 13 within the collars 14 at the end of the valve rods 15. The eccentrics are so timed with reference to the operation. of the pistons 16 as to lag behind the said pistons or close the ports 9 and 10 after the pistons have reached the end of their respectivestrokes. This arrangement is indicated by the flight arrows in Figure 1 of the drawings, where it will be seen that the piston 16 at the left of said figure has reached its downward stroke and has initiated its upward stroke while the valve 12 is continuing on its downward stroke. In practice the valve moves past the full closure position 1920. Serial No. 384,408.

during the period of rest of the pistons while the cranks 17 are passing over their dead centers. In this manner rams at the ends of the stroke of the said pistons are avoided, the ports remaining partially open while water is flowing therethrough.

The pistons 16 are preferably constructed of two disks having a soft packing 18 held therebetween. A tapered section 19 of the piston rods 20 forms seats for thesaid disks to permit of taking up any wear which may occur between the piston rod and piston.

The crank shaft 13 is driven by a power shaft 21 at the end whereof a bevel pinion 22 is provided to engage the bevel gear wheel 23 on the crank shaft. The shaft 21 may be driven by any prime mover, that most preferred being an explosive impulse engine.

The ports 9 and 10 are successively in communication with the delivery manifold 24 and the supply manifold 25. The said manifolds are preferably cast with the head 26 to form integral parts therewith. Screens 27 are introduced at the ends of the supply manifold 25 to protect the pump from the introduction of foreign matter. Opening from the delivery manifold 24 are ports 28 adapted for attachment of hose pipe or other means for utilizing the water delivered by said pump.

-While I have shown a pump employing two cylinders and equipment therefor, it will be understood that more units may be added as desired. It is preferred, however. that the units should be disposed in pairs so that the crank shaft would be properly balanced. Each unit is arranged so that during each phase of the stroke of the piston, the cylinder with which it is associated is taking water from the manifold 25 through a duct 29 by means of one of the ports 9 and 10, and is delivering water through the other port via the ducts 30 to the manifold 24. At the same time the piston which is paired with the piston just described is working in the opposite direction so that the power stroke of the one is coincident with the suction stroke of the other. thereby balancing the crank shaft on the opposite sides thereof.

It is obvious that the pistons are doubleacting, taking charge at each side thereof, from the manifold 25 via the ducts 29, to be discharged through the ports ,9 and 10, as

the case may be, on the return stroke of the same cycle of the piston.

It Will be observed that by reason of the excessive port openings which are pro'vid'ed, the movement of the water by the pistons 16 is not impeded or retarded, and further, by disposing the valves 12 so that they follow in their operation the pistons 16 the flow of Water is not checked and the danger of a Water ram With the consequent damage to the construction, is avoided. Also it Willbe observed that, by, arranging. the "movement of the valves to cross the ports during the movement of the crank operating the pistons When passing the dead center, the said ports are both closed and opened in correspondence With the action of the piston, With .the result that the column of Water delivered from the said pump is coni tinuous and any vibration therein is avoided.

Zaim."

In a multiple unit pump, a base casing, a. cylinder block supported thereon, a plurality of cylinders in said block, said cylinders having double ports opening into each end of said block, pistons in said cylinders, slide ,valves at each end of said block for-closing said cylinder ports a crank shaft longitudinally disposed in 'said casing beneath said block, balanced connection between said shaft and pistons, eccentric COI1I16CtlO1I'l18- tween said shaft and valves, and in saidcasing, a bevel gear on said shaft intermediate JOHN A. vIvARTTAs 

